html,body{
    height: 100%;
}
.learn-side-menu {
    width: 200px;
    height: 100%;
    top: 61px;
    background-color: #d8e2ea;
    position: fixed;
}

.learn-side-menu-body {
    overflow-x: hidden;
}

.learn-side-menu-body>ul>li>a:hover{
    background-color: #ffa726!important;
}

.learn-side-menu-li {
    margin-left: 15px;
}
.learn-side-menu-li>a:focus {
    background-color: #d8e2ea!important;
}

.learn-side-menu-li>a:hover {
    background-color: #ffa726!important;
}

.learn-content {
    position: absolute;
    left: 200px;
    top: 61px;
    right: 0px;
    bottom: 40px;
    overflow: hidden;
    z-index: 998;
    width: auto;
    box-sizing: border-box;
}

.learn-content-nav {
    position: relative;
    height: 41px;
    background: #e5efee;
    line-height: 40px;
    border-bottom: solid 1px #97a0a9;
}

.learn-content-button-left {
    position: absolute;
    width: 40px;
    height: 40px;
    text-align: center;
    color: #999;
    z-index: 2;
    top: 0;
    left: 0;
    border: 0;
    background: #fff;
    outline: none;
}

.learn-content-button-right {
    position: absolute;
    width: 40px;
    height: 40px;
    text-align: center;
    color: #999;
    z-index: 2;
    top: 0;
    right: 0;
    border: 0;
    background: #fff;
    outline: none;
}

.learn-nav {
    margin-left: 40px;
    width: 10000px;
    height: 40px;
    overflow: hidden;
}

.learn-nav-div{
    float: left;
}

.learn-nav-div>a{
    display: block;/*span、a等标签，正常情况下士不能设置宽高的，加上该属性之后，就可以触发让这类标签表现得如块级元素一样，可以设置宽高。注意IE6不支持inline-block属性，可以用hack来解决：*display:inline;zoom:1;*/
    float: left;
    color: #655a5a;
    padding: 0 15px;
    text-decoration: none;
    border-right: solid 1px #c1dee2;
}

.learn-nav-div>a>i:hover{
    color: #ff0000;
}

.learn-nav-div>a.active{
    background: #39aef5;
    color:#fff;
    text-decoration: none;
}

.learn-div-iframe{
    height: calc(100% - 40px);
    overflow: hidden;
}

.learn-iframe{
   height: 100%;
    width: 100%;
    border-width: 0;
}

.learn-footer{
    position: fixed;
    left:200px;
    right: 0;
    bottom: 0;
    height: 40px;
    background: #b4d6d3;
    line-height: 40px;
    padding: 0 20px;
}